Lachenal & Co. was a British firm producing concertinas from approximately 1850–1936. The firm was founded by Louis L. Lachenal, a Swiss emigrant to the United Kingdom, who arrived there in 1839, and

The English concertina is a member of the concertina family of free-reed musical instruments. Invented in England in 1829, it was the first instrument of what would become the concertina family.